Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd997d3bbd5981eb41c8870204f12e5d5113ab91c9445f7f7dd4f1d0fa8ef31' 
  AND token = 'tInZaCCcgCvGvjq+r1JW3KK3xTNmvn7yOolh8CuIOfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}